1. Opposites Attract Like Charges Repel More Charge the greater the force. The more distance the weaker the force

2. Nuclear Charge Increases Total electric charge in a nucleus. It is equal to the number of protons. The Nucleus is what attracts electrons and keeps them in the atom.

3. The more protons the stronger the nucleus can pull.

4. 1 H Hydrogen 1 3 Li Lithium 7 11 Na Sodium 23

5. 1 H Hydrogen 1 3 Li Lithium 7 11 Na Sodium 23

6. 1 H Hydrogen 1 3 Li Lithium 7 11 Na Sodium 23

7. 1 H Hydrogen 1 3 Li Lithium 7 11 Na Sodium 23

8. 1 H Hydrogen 1 3 Li Lithium 7 11 Na Sodium 23 As you go down a group or column in the periodic table the number of energy levels increases.

9. 1 H Hydrogen 1 3 Li Lithium 7 11 Na Sodium 23 As you go down a group or column in the periodic table the number of energy levels increases.

10. 5 B Boron 1 3 Li Lithium 7 4 Be Beryllium 23

11. 5 B Boron 1 3 Li Lithium 7 4 Be Beryllium 23

12. 5 B Boron 1 3 Li Lithium 7 4 Be Beryllium 23

13. 5 B Boron 1 3 Li Lithium 7 4 Be Beryllium 23

14. 5 B Boron 11 3 Li Lithium 7 4 Be Beryllium 9 As you go across a period the number of energy levels remains constant.

15. - - - - - - - - - - - +11 Electrons in an atom can shield each other from the pull of the nucleus.

16. As you go across a period electron shielding is constant. As you go down a group electron shielding increases.

17. Nuclear Charge Increases Electron Shielding Increases Electron Shielding Remains Constant